Chemical pumps are commonly used in the industries like oil and gas, chemical, pulp & paper, etc. The function is to inject a certain amount of chemicals into the system to improve production or prevent corrosion. Usually, anti-siphon valve, back pressure valve and check valve are installed downstream to ensure the chemical pump works properly.

FITOK CSV series anti-siphon back pressure check valves integrate three different functions into one, help you to save space, improve installation efficiency and reduce maintenance:
Anti-Siphon Function: reduce unwanted siphoning due to wellhead or pipeline condition change.

Back Pressure Function: provide back pressure to keep the consistent output flow from chemical pump.

Non-Return Function: prevent fluids flowing back to the chemical pump.


  • Integrate three different functions into one, fewer number of connections improve the system reliability
  • Small size, light weight and low installation space requirements, easy for installation and operation
  • Inline adjustment of cracking pressure with broad pressure range
  • Patent pending

Technical Data

Maximum Working Pressure10000 psig (690 bar)
Working Temperature0 °F ~ 392 °F (-18 °C ~ 200 °C)
Cracking Pressure Range50 ~ 450 psig (3.44 ~ 31.0 bar)
Orifice Size0.189 in. (4.8 mm)
Materials: Body, Stem, Bonnet/Sealing Part316 SS/FKM, PTFE
Flow3 GPM @ 1000 psig

In addition to the CSV series anti-siphon back pressure check valves, FITOK also provides a variety of general instrumentation check valves ( CV, CH, CO, CA, COA, CL and CW series) and medium and high pressure check valves (10C, 10CO, 15C, 15CO, 20C, 20CO, 60C and 60 CO Series) for different applications

if you have any inquiries or any questions about CSV Series Anti-Siphon Back Pressure Check Valves as well as any other FITOK products please contact our sales team: or call 01942601209